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operating system

How do I execute a script under UNIX or Linux like operating system using command prompt?
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HowTo: Save File in Vi / Vim Text Editor

I'm new to Linux or UNIX like operating system. I just wanted to create a file called demo.txt and save & close it using vi text editor. How do I save a file using vi?
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How do I perform a simple and rather naive benchmark of the disks seek and transfer performance under FreeBSD operating system? How do I perform a simple measurement of the I/O read command overhead for my RAID-1 array under FreeBSD operating systems?
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Linux: Find Out Apache User Name

How do I find out my apache username under Linux operating system or CentOS Linux server?
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Applescript: Run or Call a Shell Script

How do run a shell script with an AppleScript? How do I integrate shell scripts into AppleScript? How do I call a shell script called /path/to/chkhost.sh using an applescript?
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FreeBSD Find Out Network Card / Port Speed

Q. Under Linux I can use Ethtool and mii-tool, but they are not available under FreeBSD. How do I tell the port speed of the nic under FreeBSD operating system?
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Q. How do I install sar command under FreeBSD to collect, report, or save system activity information? How can I setup freebsd accounting?
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